Design and Performance Analysis of Small Size Iris Recognition Lens
This study designed and analyzed a miniaturized iris recognition lens by leveraging on the natural anticounterfeiting feature of the human iris.The lens comprises four even aspheric lenses,with an f-number of 1.8,a full field-of-view angle of 42°,a total length of 2.5 mm for the optical system,and working distance is 184-389 mm.Moreover,in the range of variable working distance,for the iris recognition lens,the modulation transfer function(MTF)values at a half-cutoff frequency for each field of view all exceed 0.4,the optical distortion is lower than 0.6%,and the relative illuminance is greater than 80%.The material of the designed lens is made of optical plastic,which has advantages of small volume,lightweight,low production cost,low f-number,and good imaging quality.Therefore,the designed iris recognition lens can be applied to efficient biometric recognition in small mobile devices,such as smartphones.
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